momentum de-isotropifier ( http://en.wikipedia.org/wiki/I... ). This is possible only at high-velocity flow regimes near or beyond the speed of sound.
Momentum is conserved as the outward forces are symmetric. However the momentum is constrained to a reduced number of dimensions (i.e. 1 or 2 instead of 3) and is directionally and spatially inhomogeneous, which overrules the isotropy assumption that defines basis of modern thermodynamics known as static temperature. The 2nd law fails to distinguish between static and dynamic temperature. At supersonic flows, dynamic temperature exceeds static temperature. Thermal imaging (radiation heat regime) only pickups up static temperature and Doppler shift of light. However, dynamic temperature (which is directly related to dynamic pressure) becomes significant near and beyond the sound barrier, is not picked up by thermal imaging, and only can transfer heat in the conductive and convective heat regimes.
At the speed of sound, and far below the speed of light, the energy corresponding to the dynamic temperature is much more significant than the energy associated with the Doppler shift of light. Thermodynamically, the radiation heat regime dominates when said fluid is isolated from another by a low density medium, however, when a thermally conductive and/or convective medium connects the two fluids, then the conductive and/or convective heat regimes may take over. This makes it possible for spontaneous heat flow to reverse periodically and remain spontaneous by periodically varying the thermal conductivity between a hot non-turbulent fluid (which is capacitive by analogy to electromagnetics) and a cold, hypersonically-turbulent fluid (which is inductive by analogy to electromagnetics). Heat flows from the former to latter in the radiative regime. However, in the conductive and convective regimes, the reverse is true as long as the bulk kinetic energy of flows are sufficient to overcome the static thermal energy of the former (i.e. if the latter has a higher stagnation-point temperature). Admittance and impedance, though usually defined for only ideal waveforms, have instantaneous equivalents which can work for any waveform. Any such instantaneous equivalent is valid only locally (i.e. as a spatial differential). The laws of the electrodynamic ether and the laws of fluid dynamics mutually analogous to each other, with the only difference being that the former invokes an inhomogeneous distribution of net charge enabling different symmetry groups ( http://en.wikipedia.org/wiki/S... ) and conditions for power laws ( http://en.wikipedia.org/wiki/P... ).